Ethereal-users: [Ethereal-users] How to capture packets with defined string in data?

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From: "Dabasinskas, Martynas" <MDabasinskas@xxxxxxxxxxxxxxx>
Date: Tue, 16 Nov 2004 12:26:59 +0100
Title: Message
Hello,
maybe somebody could help to me.  I've installed ethereal few days ago.
Objective is to capture only packets which have string lets say "123" in packets data.
 
Question: is it possible to set some capture filter to capture only these packets with 123 inside ?
For this moment  I have to capture all TCP packets into file and after that using display filter search for string 123 in the file, but it is not a good idea for me, because traffic is realy big,

Please help :(